Is it the fule pump?, Spluttering and stalling! |
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Is it the fule pump?, Spluttering and stalling! |
chrispovoas |
Apr 8 2023, 04:00 AM
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#1
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Member Group: Members Posts: 61 Joined: 8-April 23 From: New Zealand Member No.: 27,285 Region Association: Australia and New Zealand |
Hi guys, Chris from New Zealand here....finally bought myself a 914! Shes a '73 2.0 with original FI. Had her about a week, after standing for 8 years.
Previous owner spent some time and money getting her on the road as part of the sale to me, but still a bit of work to be done! I'll try and attach a picture. Took her for a shakedown run today for about 3 hours but then she started coughing and spluttering then stalled at about 60mph. Coasted to a halt, ignition on/off and away she went again for about half an hour.. Same thing again, ignition on/off and all was well for another 20 min.. This went on and on and the intervals between spluttering and stalling got more frequent until i just about made it home. Felt like fuel rather than electrical... Could it be the fuel pump, or any other ideas? I have a feeling I'll be using the forum quite a bit (IMG:style_emoticons/default/smile.gif) Nice to meet everyone! |
emerygt350 |
Apr 10 2023, 05:05 AM
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#2
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Advanced Member Group: Members Posts: 2,131 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
If the car idles after warm, and idles at 1300ish when cold, your aar is working great. Save the "rebuilt" one for the Future. Rebuilding one isn't exactly normal (check the threads on that) so I am a little suspect anyway.
You can test your aar function buy pulling and blocking the hose from the air filter housing to the aar. If the car is warm, it shouldn't change anything. If the car is cold the idle should drop and if cold enough the car should stall. There are 3 bits to the cold start. 1 the aar which bumps up the idle speed by letting extra air into the plenum. 2 the ECU using a cylinder head temp sensor to cause enrichment of the air fuel ratio 3 the csv which is an injector mounted in the plenum and gives you a shot of extra fuel at start (the timing and conditions necessary for this are debated endlessly). Rough running at the start and then recovery with poor performance till warm makes me lean toward an issue with 2. |
chrispovoas |
Apr 11 2023, 02:06 AM
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#3
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Member Group: Members Posts: 61 Joined: 8-April 23 From: New Zealand Member No.: 27,285 Region Association: Australia and New Zealand |
If the car idles after warm, and idles at 1300ish when cold, your aar is working great. Save the "rebuilt" one for the Future. Rebuilding one isn't exactly normal (check the threads on that) so I am a little suspect anyway. You can test your aar function buy pulling and blocking the hose from the air filter housing to the aar. If the car is warm, it shouldn't change anything. If the car is cold the idle should drop and if cold enough the car should stall. There are 3 bits to the cold start. 1 the aar which bumps up the idle speed by letting extra air into the plenum. 2 the ECU using a cylinder head temp sensor to cause enrichment of the air fuel ratio 3 the csv which is an injector mounted in the plenum and gives you a shot of extra fuel at start (the timing and conditions necessary for this are debated endlessly). Rough running at the start and then recovery with poor performance till warm makes me lean toward an issue with 2. Thanks! Looks easy to test the AAR.. The other comments also point to the CHT sensor. I think their quite cheap, but of course it has to come from the USA, so theres a few weeks for that! If the AAR tests ok, maybe worth just puting the CHT sensor on order... |
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